<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/Welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意:只允许为第三级分类设置相关参数!"
        type="warning"
        :closable="false"></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联 -->
          <el-cascader
            v-model="selectCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          >
          </el-cascader>
        </el-col>
      </el-row>

      <!-- 标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable @close="handleClose(i,scope.row)">{{ item }}</el-tag>
                  <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="deletePrimary(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable @close="handleClose(i,scope.row)">{{ item }}</el-tag>
                  <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->

            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="deletePrimary(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClose"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClose"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      //级联选择框配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择器双向绑定到的数组
      selectCateKeys: [],
      //被激活标签页的名称
      activeName: "many",
      //动态参数数据
      manyTableData: [],
      //静态参数数据
      onlyTableData: [],
      //控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单参数对象
      addForm: {
        attr_name: "",
      },
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //控制修改对话框显示与隐藏
      editDialogVisible: false,
      //修改表单的数据对象
      editForm: {},
      //修改表单的验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) return this.$message.error("获取列表失败");
      this.cateList = res.data;
    },
    //级联选择框选中选项，触发此函数
    handleChange() {
      this.getParamsData();
    },
    //这是tab页签点击事件处理函数
    handleTabClick() {
      this.getParamsData();
    },
    //获取参数的列表数据
    async getParamsData() {
      //证明选择不是三级列
      if (this.selectCateKeys.length !== 3) {
        this.selectCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      //证明选中的是三级
      //根据选中的ID和当前所获取的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200)
        return this.$message.error("获取参数列表失败");
      console.log(res.data);
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals.split("");
        //控制文本框的显示与隐藏
        item.inputVisible = false;
        //文本框输入的值
        item.inputVisible = ''
      });
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    //监听添加对话框的关闭事件
    addDialogClose() {
      this.$refs.addFormRef.resetFields();
    },
    //点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) return this.$message.error("获取失败");
        this.$message.success("添加成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    //点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取失败");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    //重置修改的表单
    editDialogClose() {
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        );
        if (res.meta.status !== 200) return this.$message.error("修改失败");
        this.$message.success("修改成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    //点击删除按钮，删除参数
    async deletePrimary(attr_id) {
      //是否删除弹窗
      const confirmRsult = await this.$confirm(
        "此操作将永久删除改参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      if (confirmRsult !== "confirm") return this.$message.info("取消删除");
      //删除业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) return this.$message.error("删除失败");
      this.$message.success("删除成功");
      this.getParamsData();
    },
    //文本框失去焦点，或点击了 enter都会触发
    async handleInputConfirm(row){
      if (row.inputValue.trim().length ===0) {
          row.inputValue = '';
          row.inputVisible = false;
          return
      }
       //如果没有return ，则证明输入正确内容
       row.attr_vals.push(row.inputValue.trim());
       row.inputValue = '';
       row.inputVisible = false;
       //需要发起请求，保存这次操作
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
         attr_name:row.attr_name,
         attr_sel:row.attr_sel,
         attr_vals:row.attr_vals.join(''),
       });
       if(res.meta.status !== 200) return this.$message.error('添加失败');
        this.$message.success('添加成功')
    },
    //添加文本输入框的显示
    showInput(row){
        row.inputVisible = true;
        //让文本框自动获取焦点
        //$nextTick方法的动作：就是当页面上元素重新被渲染之后，才会指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    //删除对应的参数选项
    async handleClose(i,row){
      row.attr_vals.splice(i,1);
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
         attr_name:row.attr_name,
         attr_sel:row.attr_sel,
         attr_vals:row.attr_vals.join(' '),
       });
       if(res.meta.status !== 200) return this.$message.error('删除失败');
        this.$message.success('删除成功')
    }
  },
  computed: {
    //如果按钮需要禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    cateId() {
      if (this.selectCateKeys.length == 3) {
        return this.selectCateKeys[2];
      }
      return null;
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态参数";
    },
  },
};
</script>

<style scoped>
.cat_opt {
  margin: 15px 0px;
}
</style>